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FFmpeg/libswscale/utils.c

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  1. /*

  2.  * Copyright (C) 2001-2003 Michael Niedermayer <michaelni@gmx.at>

  3.  *

  4.  * This file is part of Libav.

  5.  *

  6.  * Libav is free software; you can redistribute it and/or

  7.  * modify it under the terms of the GNU Lesser General Public

  8.  * License as published by the Free Software Foundation; either

  9.  * version 2.1 of the License, or (at your option) any later version.

  10.  *

  11.  * Libav is distributed in the hope that it will be useful,

  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  14.  * Lesser General Public License for more details.

  15.  *

  16.  * You should have received a copy of the GNU Lesser General Public

  17.  * License along with Libav; if not, write to the Free Software

  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  19.  */

  20. 

  21. #include "config.h"

  22. 

  23. #define _SVID_SOURCE // needed for MAP_ANONYMOUS

  24. #include <assert.h>

  25. #include <inttypes.h>

  26. #include <math.h>

  27. #include <stdio.h>

  28. #include <string.h>

  29. #if HAVE_SYS_MMAN_H

  30. #include <sys/mman.h>

  31. #if defined(MAP_ANON) && !defined(MAP_ANONYMOUS)

  32. #define MAP_ANONYMOUS MAP_ANON

  33. #endif

  34. #endif

  35. #if HAVE_VIRTUALALLOC

  36. #define WIN32_LEAN_AND_MEAN

  37. #include <windows.h>

  38. #endif

  39. 

  40. #include "libavutil/avutil.h"

  41. #include "libavutil/bswap.h"

  42. #include "libavutil/cpu.h"

  43. #include "libavutil/intreadwrite.h"

  44. #include "libavutil/mathematics.h"

  45. #include "libavutil/opt.h"

  46. #include "libavutil/pixdesc.h"

  47. #include "libavutil/x86_cpu.h"

  48. #include "rgb2rgb.h"

  49. #include "swscale.h"

  50. #include "swscale_internal.h"

  51. 

  52. unsigned swscale_version(void)

  53. {

  54.     return LIBSWSCALE_VERSION_INT;

  55. }

  56. 

  57. const char *swscale_configuration(void)

  58. {

  59.     return LIBAV_CONFIGURATION;

  60. }

  61. 

  62. const char *swscale_license(void)

  63. {

  64. #define LICENSE_PREFIX "libswscale license: "

  65.     return LICENSE_PREFIX LIBAV_LICENSE + sizeof(LICENSE_PREFIX) - 1;

  66. }

  67. 

  68. #define RET 0xC3 // near return opcode for x86

  69. 

  70. typedef struct FormatEntry {

  71.     int is_supported_in, is_supported_out;

  72. } FormatEntry;

  73. 

  74. static const FormatEntry format_entries[PIX_FMT_NB] = {

  75.     [PIX_FMT_YUV420P]     = { 1, 1 },

  76.     [PIX_FMT_YUYV422]     = { 1, 1 },

  77.     [PIX_FMT_RGB24]       = { 1, 1 },

  78.     [PIX_FMT_BGR24]       = { 1, 1 },

  79.     [PIX_FMT_YUV422P]     = { 1, 1 },

  80.     [PIX_FMT_YUV444P]     = { 1, 1 },

  81.     [PIX_FMT_YUV410P]     = { 1, 1 },

  82.     [PIX_FMT_YUV411P]     = { 1, 1 },

  83.     [PIX_FMT_GRAY8]       = { 1, 1 },

  84.     [PIX_FMT_MONOWHITE]   = { 1, 1 },

  85.     [PIX_FMT_MONOBLACK]   = { 1, 1 },

  86.     [PIX_FMT_PAL8]        = { 1, 0 },

  87.     [PIX_FMT_YUVJ420P]    = { 1, 1 },

  88.     [PIX_FMT_YUVJ422P]    = { 1, 1 },

  89.     [PIX_FMT_YUVJ444P]    = { 1, 1 },

  90.     [PIX_FMT_UYVY422]     = { 1, 1 },

  91.     [PIX_FMT_UYYVYY411]   = { 0, 0 },

  92.     [PIX_FMT_BGR8]        = { 1, 1 },

  93.     [PIX_FMT_BGR4]        = { 0, 1 },

  94.     [PIX_FMT_BGR4_BYTE]   = { 1, 1 },

  95.     [PIX_FMT_RGB8]        = { 1, 1 },

  96.     [PIX_FMT_RGB4]        = { 0, 1 },

  97.     [PIX_FMT_RGB4_BYTE]   = { 1, 1 },

  98.     [PIX_FMT_NV12]        = { 1, 1 },

  99.     [PIX_FMT_NV21]        = { 1, 1 },

  100.     [PIX_FMT_ARGB]        = { 1, 1 },

  101.     [PIX_FMT_RGBA]        = { 1, 1 },

  102.     [PIX_FMT_ABGR]        = { 1, 1 },

  103.     [PIX_FMT_BGRA]        = { 1, 1 },

  104.     [PIX_FMT_GRAY16BE]    = { 1, 1 },

  105.     [PIX_FMT_GRAY16LE]    = { 1, 1 },

  106.     [PIX_FMT_YUV440P]     = { 1, 1 },

  107.     [PIX_FMT_YUVJ440P]    = { 1, 1 },

  108.     [PIX_FMT_YUVA420P]    = { 1, 1 },

  109.     [PIX_FMT_RGB48BE]     = { 1, 1 },

  110.     [PIX_FMT_RGB48LE]     = { 1, 1 },

  111.     [PIX_FMT_RGB565BE]    = { 1, 1 },

  112.     [PIX_FMT_RGB565LE]    = { 1, 1 },

  113.     [PIX_FMT_RGB555BE]    = { 1, 1 },

  114.     [PIX_FMT_RGB555LE]    = { 1, 1 },

  115.     [PIX_FMT_BGR565BE]    = { 1, 1 },

  116.     [PIX_FMT_BGR565LE]    = { 1, 1 },

  117.     [PIX_FMT_BGR555BE]    = { 1, 1 },

  118.     [PIX_FMT_BGR555LE]    = { 1, 1 },

  119.     [PIX_FMT_YUV420P16LE] = { 1, 1 },

  120.     [PIX_FMT_YUV420P16BE] = { 1, 1 },

  121.     [PIX_FMT_YUV422P16LE] = { 1, 1 },

  122.     [PIX_FMT_YUV422P16BE] = { 1, 1 },

  123.     [PIX_FMT_YUV444P16LE] = { 1, 1 },

  124.     [PIX_FMT_YUV444P16BE] = { 1, 1 },

  125.     [PIX_FMT_RGB444LE]    = { 1, 1 },

  126.     [PIX_FMT_RGB444BE]    = { 1, 1 },

  127.     [PIX_FMT_BGR444LE]    = { 1, 1 },

  128.     [PIX_FMT_BGR444BE]    = { 1, 1 },

  129.     [PIX_FMT_Y400A]       = { 1, 0 },

  130.     [PIX_FMT_BGR48BE]     = { 1, 1 },

  131.     [PIX_FMT_BGR48LE]     = { 1, 1 },

  132.     [PIX_FMT_YUV420P9BE]  = { 1, 1 },

  133.     [PIX_FMT_YUV420P9LE]  = { 1, 1 },

  134.     [PIX_FMT_YUV420P10BE] = { 1, 1 },

  135.     [PIX_FMT_YUV420P10LE] = { 1, 1 },

  136.     [PIX_FMT_YUV422P9BE]  = { 1, 1 },

  137.     [PIX_FMT_YUV422P9LE]  = { 1, 1 },

  138.     [PIX_FMT_YUV422P10BE] = { 1, 1 },

  139.     [PIX_FMT_YUV422P10LE] = { 1, 1 },

  140.     [PIX_FMT_YUV444P9BE]  = { 1, 1 },

  141.     [PIX_FMT_YUV444P9LE]  = { 1, 1 },

  142.     [PIX_FMT_YUV444P10BE] = { 1, 1 },

  143.     [PIX_FMT_YUV444P10LE] = { 1, 1 },

  144.     [PIX_FMT_GBRP]        = { 1, 0 },

  145.     [PIX_FMT_GBRP9LE]     = { 1, 0 },

  146.     [PIX_FMT_GBRP9BE]     = { 1, 0 },

  147.     [PIX_FMT_GBRP10LE]    = { 1, 0 },

  148.     [PIX_FMT_GBRP10BE]    = { 1, 0 },

  149.     [PIX_FMT_GBRP16LE]    = { 1, 0 },

  150.     [PIX_FMT_GBRP16BE]    = { 1, 0 },

  151. };

  152. 

  153. int sws_isSupportedInput(enum PixelFormat pix_fmt)

  154. {

  155.     return (unsigned)pix_fmt < PIX_FMT_NB ?

  156.            format_entries[pix_fmt].is_supported_in : 0;

  157. }

  158. 

  159. int sws_isSupportedOutput(enum PixelFormat pix_fmt)

  160. {

  161.     return (unsigned)pix_fmt < PIX_FMT_NB ?

  162.            format_entries[pix_fmt].is_supported_out : 0;

  163. }

  164. 

  165. extern const int32_t ff_yuv2rgb_coeffs[8][4];

  166. 

  167. const char *sws_format_name(enum PixelFormat format)

  168. {

  169.     if ((unsigned)format < PIX_FMT_NB && av_pix_fmt_descriptors[format].name)

  170.         return av_pix_fmt_descriptors[format].name;

  171.     else

  172.         return "Unknown format";

  173. }

  174. 

  175. static double getSplineCoeff(double a, double b, double c, double d,

  176.                              double dist)

  177. {

  178.     if (dist <= 1.0)

  179.         return ((d * dist + c) * dist + b) * dist + a;

  180.     else

  181.         return getSplineCoeff(0.0,

  182.                                b + 2.0 * c + 3.0 * d,

  183.                                c + 3.0 * d,

  184.                               -b - 3.0 * c - 6.0 * d,

  185.                               dist - 1.0);

  186. }

  187. 

  188. static int initFilter(int16_t **outFilter, int32_t **filterPos,

  189.                       int *outFilterSize, int xInc, int srcW, int dstW,

  190.                       int filterAlign, int one, int flags, int cpu_flags,

  191.                       SwsVector *srcFilter, SwsVector *dstFilter,

  192.                       double param[2], int is_horizontal)

  193. {

  194.     int i;

  195.     int filterSize;

  196.     int filter2Size;

  197.     int minFilterSize;

  198.     int64_t *filter    = NULL;

  199.     int64_t *filter2   = NULL;

  200.     const int64_t fone = 1LL << 54;

  201.     int ret            = -1;

  202. 

  203.     emms_c(); // FIXME should not be required but IS (even for non-MMX versions)

  204. 

  205.     // NOTE: the +3 is for the MMX(+1) / SSE(+3) scaler which reads over the end

  206.     FF_ALLOC_OR_GOTO(NULL, *filterPos, (dstW + 3) * sizeof(**filterPos), fail);

  207. 

  208.     if (FFABS(xInc - 0x10000) < 10) { // unscaled

  209.         int i;

  210.         filterSize = 1;

  211.         FF_ALLOCZ_OR_GOTO(NULL, filter,

  212.                           dstW * sizeof(*filter) * filterSize, fail);

  213. 

  214.         for (i = 0; i < dstW; i++) {

  215.             filter[i * filterSize] = fone;

  216.             (*filterPos)[i]        = i;

  217.         }

  218.     } else if (flags & SWS_POINT) { // lame looking point sampling mode

  219.         int i;

  220.         int xDstInSrc;

  221.         filterSize = 1;

  222.         FF_ALLOC_OR_GOTO(NULL, filter,

  223.                          dstW * sizeof(*filter) * filterSize, fail);

  224. 

  225.         xDstInSrc = xInc / 2 - 0x8000;

  226.         for (i = 0; i < dstW; i++) {

  227.             int xx = (xDstInSrc - ((filterSize - 1) << 15) + (1 << 15)) >> 16;

  228. 

  229.             (*filterPos)[i] = xx;

  230.             filter[i]       = fone;

  231.             xDstInSrc      += xInc;

  232.         }

  233.     } else if ((xInc <= (1 << 16) && (flags & SWS_AREA)) ||

  234.                (flags & SWS_FAST_BILINEAR)) { // bilinear upscale

  235.         int i;

  236.         int xDstInSrc;

  237.         filterSize = 2;

  238.         FF_ALLOC_OR_GOTO(NULL, filter,

  239.                          dstW * sizeof(*filter) * filterSize, fail);

  240. 

  241.         xDstInSrc = xInc / 2 - 0x8000;

  242.         for (i = 0; i < dstW; i++) {

  243.             int xx = (xDstInSrc - ((filterSize - 1) << 15) + (1 << 15)) >> 16;

  244.             int j;

  245. 

  246.             (*filterPos)[i] = xx;

  247.             // bilinear upscale / linear interpolate / area averaging

  248.             for (j = 0; j < filterSize; j++) {

  249.                 int64_t coeff = fone - FFABS((xx << 16) - xDstInSrc) *

  250.                                 (fone >> 16);

  251.                 if (coeff < 0)

  252.                     coeff = 0;

  253.                 filter[i * filterSize + j] = coeff;

  254.                 xx++;

  255.             }

  256.             xDstInSrc += xInc;

  257.         }

  258.     } else {

  259.         int64_t xDstInSrc;

  260.         int sizeFactor;

  261. 

  262.         if (flags & SWS_BICUBIC)

  263.             sizeFactor = 4;

  264.         else if (flags & SWS_X)

  265.             sizeFactor = 8;

  266.         else if (flags & SWS_AREA)

  267.             sizeFactor = 1;     // downscale only, for upscale it is bilinear

  268.         else if (flags & SWS_GAUSS)

  269.             sizeFactor = 8;     // infinite ;)

  270.         else if (flags & SWS_LANCZOS)

  271.             sizeFactor = param[0] != SWS_PARAM_DEFAULT ? ceil(2 * param[0]) : 6;

  272.         else if (flags & SWS_SINC)

  273.             sizeFactor = 20;    // infinite ;)

  274.         else if (flags & SWS_SPLINE)

  275.             sizeFactor = 20;    // infinite ;)

  276.         else if (flags & SWS_BILINEAR)

  277.             sizeFactor = 2;

  278.         else {

  279.             sizeFactor = 0;     // GCC warning killer

  280.             assert(0);

  281.         }

  282. 

  283.         if (xInc <= 1 << 16)

  284.             filterSize = 1 + sizeFactor;    // upscale

  285.         else

  286.             filterSize = 1 + (sizeFactor * srcW + dstW - 1) / dstW;

  287. 

  288.         filterSize = FFMIN(filterSize, srcW - 2);

  289.         filterSize = FFMAX(filterSize, 1);

  290. 

  291.         FF_ALLOC_OR_GOTO(NULL, filter,

  292.                          dstW * sizeof(*filter) * filterSize, fail);

  293. 

  294.         xDstInSrc = xInc - 0x10000;

  295.         for (i = 0; i < dstW; i++) {

  296.             int xx = (xDstInSrc - ((filterSize - 2) << 16)) / (1 << 17);

  297.             int j;

  298.             (*filterPos)[i] = xx;

  299.             for (j = 0; j < filterSize; j++) {

  300.                 int64_t d = (FFABS(((int64_t)xx << 17) - xDstInSrc)) << 13;

  301.                 double floatd;

  302.                 int64_t coeff;

  303. 

  304.                 if (xInc > 1 << 16)

  305.                     d = d * dstW / srcW;

  306.                 floatd = d * (1.0 / (1 << 30));

  307. 

  308.                 if (flags & SWS_BICUBIC) {

  309.                     int64_t B = (param[0] != SWS_PARAM_DEFAULT ? param[0] :   0) * (1 << 24);

  310.                     int64_t C = (param[1] != SWS_PARAM_DEFAULT ? param[1] : 0.6) * (1 << 24);

  311. 

  312.                     if (d >= 1LL << 31) {

  313.                         coeff = 0.0;

  314.                     } else {

  315.                         int64_t dd  = (d  * d) >> 30;

  316.                         int64_t ddd = (dd * d) >> 30;

  317. 

  318.                         if (d < 1LL << 30)

  319.                             coeff =  (12 * (1 << 24) -  9 * B - 6 * C) * ddd +

  320.                                     (-18 * (1 << 24) + 12 * B + 6 * C) *  dd +

  321.                                       (6 * (1 << 24) -  2 * B)         * (1 << 30);

  322.                         else

  323.                             coeff =      (-B -  6 * C) * ddd +

  324.                                       (6 * B + 30 * C) * dd  +

  325.                                     (-12 * B - 48 * C) * d   +

  326.                                       (8 * B + 24 * C) * (1 << 30);

  327.                     }

  328.                     coeff *= fone >> (30 + 24);

  329.                 }

  330. #if 0

  331.                 else if (flags & SWS_X) {

  332.                     double p  = param ? param * 0.01 : 0.3;

  333.                     coeff     = d ? sin(d * M_PI) / (d * M_PI) : 1.0;

  334.                     coeff    *= pow(2.0, -p * d * d);

  335.                 }

  336. #endif

  337.                 else if (flags & SWS_X) {

  338.                     double A = param[0] != SWS_PARAM_DEFAULT ? param[0] : 1.0;

  339.                     double c;

  340. 

  341.                     if (floatd < 1.0)

  342.                         c = cos(floatd * M_PI);

  343.                     else

  344.                         c = -1.0;

  345.                     if (c < 0.0)

  346.                         c = -pow(-c, A);

  347.                     else

  348.                         c = pow(c, A);

  349.                     coeff = (c * 0.5 + 0.5) * fone;

  350.                 } else if (flags & SWS_AREA) {

  351.                     int64_t d2 = d - (1 << 29);

  352.                     if (d2 * xInc < -(1LL << (29 + 16)))

  353.                         coeff = 1.0 * (1LL << (30 + 16));

  354.                     else if (d2 * xInc < (1LL << (29 + 16)))

  355.                         coeff = -d2 * xInc + (1LL << (29 + 16));

  356.                     else

  357.                         coeff = 0.0;

  358.                     coeff *= fone >> (30 + 16);

  359.                 } else if (flags & SWS_GAUSS) {

  360.                     double p = param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;

  361.                     coeff = (pow(2.0, -p * floatd * floatd)) * fone;

  362.                 } else if (flags & SWS_SINC) {

  363.                     coeff = (d ? sin(floatd * M_PI) / (floatd * M_PI) : 1.0) * fone;

  364.                 } else if (flags & SWS_LANCZOS) {

  365.                     double p = param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;

  366.                     coeff = (d ? sin(floatd * M_PI) * sin(floatd * M_PI / p) /

  367.                              (floatd * floatd * M_PI * M_PI / p) : 1.0) * fone;

  368.                     if (floatd > p)

  369.                         coeff = 0;

  370.                 } else if (flags & SWS_BILINEAR) {

  371.                     coeff = (1 << 30) - d;

  372.                     if (coeff < 0)

  373.                         coeff = 0;

  374.                     coeff *= fone >> 30;

  375.                 } else if (flags & SWS_SPLINE) {

  376.                     double p = -2.196152422706632;

  377.                     coeff = getSplineCoeff(1.0, 0.0, p, -p - 1.0, floatd) * fone;

  378.                 } else {

  379.                     coeff = 0.0; // GCC warning killer

  380.                     assert(0);

  381.                 }

  382. 

  383.                 filter[i * filterSize + j] = coeff;

  384.                 xx++;

  385.             }

  386.             xDstInSrc += 2 * xInc;

  387.         }

  388.     }

  389. 

  390.     /* apply src & dst Filter to filter -> filter2

  391.      * av_free(filter);

  392.      */

  393.     assert(filterSize > 0);

  394.     filter2Size = filterSize;

  395.     if (srcFilter)

  396.         filter2Size += srcFilter->length - 1;

  397.     if (dstFilter)

  398.         filter2Size += dstFilter->length - 1;

  399.     assert(filter2Size > 0);

  400.     FF_ALLOCZ_OR_GOTO(NULL, filter2, filter2Size * dstW * sizeof(*filter2), fail);

  401. 

  402.     for (i = 0; i < dstW; i++) {

  403.         int j, k;

  404. 

  405.         if (srcFilter) {

  406.             for (k = 0; k < srcFilter->length; k++) {

  407.                 for (j = 0; j < filterSize; j++)

  408.                     filter2[i * filter2Size + k + j] +=

  409.                         srcFilter->coeff[k] * filter[i * filterSize + j];

  410.             }

  411.         } else {

  412.             for (j = 0; j < filterSize; j++)

  413.                 filter2[i * filter2Size + j] = filter[i * filterSize + j];

  414.         }

  415.         // FIXME dstFilter

  416. 

  417.         (*filterPos)[i] += (filterSize - 1) / 2 - (filter2Size - 1) / 2;

  418.     }

  419.     av_freep(&filter);

  420. 

  421.     /* try to reduce the filter-size (step1 find size and shift left) */

  422.     // Assume it is near normalized (*0.5 or *2.0 is OK but * 0.001 is not).

  423.     minFilterSize = 0;

  424.     for (i = dstW - 1; i >= 0; i--) {

  425.         int min = filter2Size;

  426.         int j;

  427.         int64_t cutOff = 0.0;

  428. 

  429.         /* get rid of near zero elements on the left by shifting left */

  430.         for (j = 0; j < filter2Size; j++) {

  431.             int k;

  432.             cutOff += FFABS(filter2[i * filter2Size]);

  433. 

  434.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  435.                 break;

  436. 

  437.             /* preserve monotonicity because the core can't handle the

  438.              * filter otherwise */

  439.             if (i < dstW - 1 && (*filterPos)[i] >= (*filterPos)[i + 1])

  440.                 break;

  441. 

  442.             // move filter coefficients left

  443.             for (k = 1; k < filter2Size; k++)

  444.                 filter2[i * filter2Size + k - 1] = filter2[i * filter2Size + k];

  445.             filter2[i * filter2Size + k - 1] = 0;

  446.             (*filterPos)[i]++;

  447.         }

  448. 

  449.         cutOff = 0;

  450.         /* count near zeros on the right */

  451.         for (j = filter2Size - 1; j > 0; j--) {

  452.             cutOff += FFABS(filter2[i * filter2Size + j]);

  453. 

  454.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  455.                 break;

  456.             min--;

  457.         }

  458. 

  459.         if (min > minFilterSize)

  460.             minFilterSize = min;

  461.     }

  462. 

  463.     if (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) {

  464.         // we can handle the special case 4, so we don't want to go the full 8

  465.         if (minFilterSize < 5)

  466.             filterAlign = 4;

  467. 

  468.         /* We really don't want to waste our time doing useless computation, so

  469.          * fall back on the scalar C code for very small filters.

  470.          * Vectorizing is worth it only if you have a decent-sized vector. */

  471.         if (minFilterSize < 3)

  472.             filterAlign = 1;

  473.     }

  474. 

  475.     if (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) {

  476.         // special case for unscaled vertical filtering

  477.         if (minFilterSize == 1 && filterAlign == 2)

  478.             filterAlign = 1;

  479.     }

  480. 

  481.     assert(minFilterSize > 0);

  482.     filterSize = (minFilterSize + (filterAlign - 1)) & (~(filterAlign - 1));

  483.     assert(filterSize > 0);

  484.     filter = av_malloc(filterSize * dstW * sizeof(*filter));

  485.     if (filterSize >= MAX_FILTER_SIZE * 16 /

  486.                       ((flags & SWS_ACCURATE_RND) ? APCK_SIZE : 16) || !filter)

  487.         goto fail;

  488.     *outFilterSize = filterSize;

  489. 

  490.     if (flags & SWS_PRINT_INFO)

  491.         av_log(NULL, AV_LOG_VERBOSE,

  492.                "SwScaler: reducing / aligning filtersize %d -> %d\n",

  493.                filter2Size, filterSize);

  494.     /* try to reduce the filter-size (step2 reduce it) */

  495.     for (i = 0; i < dstW; i++) {

  496.         int j;

  497. 

  498.         for (j = 0; j < filterSize; j++) {

  499.             if (j >= filter2Size)

  500.                 filter[i * filterSize + j] = 0;

  501.             else

  502.                 filter[i * filterSize + j] = filter2[i * filter2Size + j];

  503.             if ((flags & SWS_BITEXACT) && j >= minFilterSize)

  504.                 filter[i * filterSize + j] = 0;

  505.         }

  506.     }

  507. 

  508.     // FIXME try to align filterPos if possible

  509. 

  510.     // fix borders

  511.     if (is_horizontal) {

  512.         for (i = 0; i < dstW; i++) {

  513.             int j;

  514.             if ((*filterPos)[i] < 0) {

  515.                 // move filter coefficients left to compensate for filterPos

  516.                 for (j = 1; j < filterSize; j++) {

  517.                     int left = FFMAX(j + (*filterPos)[i], 0);

  518.                     filter[i * filterSize + left] += filter[i * filterSize + j];

  519.                     filter[i * filterSize + j]     = 0;

  520.                 }

  521.                 (*filterPos)[i] = 0;

  522.             }

  523. 

  524.             if ((*filterPos)[i] + filterSize > srcW) {

  525.                 int shift = (*filterPos)[i] + filterSize - srcW;

  526.                 // move filter coefficients right to compensate for filterPos

  527.                 for (j = filterSize - 2; j >= 0; j--) {

  528.                     int right = FFMIN(j + shift, filterSize - 1);

  529.                     filter[i * filterSize + right] += filter[i * filterSize + j];

  530.                     filter[i * filterSize + j]      = 0;

  531.                 }

  532.                 (*filterPos)[i] = srcW - filterSize;

  533.             }

  534.         }

  535.     }

  536. 

  537.     // Note the +1 is for the MMX scaler which reads over the end

  538.     /* align at 16 for AltiVec (needed by hScale_altivec_real) */

  539.     FF_ALLOCZ_OR_GOTO(NULL, *outFilter,

  540.                       *outFilterSize * (dstW + 3) * sizeof(int16_t), fail);

  541. 

  542.     /* normalize & store in outFilter */

  543.     for (i = 0; i < dstW; i++) {

  544.         int j;

  545.         int64_t error = 0;

  546.         int64_t sum   = 0;

  547. 

  548.         for (j = 0; j < filterSize; j++) {

  549.             sum += filter[i * filterSize + j];

  550.         }

  551.         sum = (sum + one / 2) / one;

  552.         for (j = 0; j < *outFilterSize; j++) {

  553.             int64_t v = filter[i * filterSize + j] + error;

  554.             int intV  = ROUNDED_DIV(v, sum);

  555.             (*outFilter)[i * (*outFilterSize) + j] = intV;

  556.             error                                  = v - intV * sum;

  557.         }

  558.     }

  559. 

  560.     (*filterPos)[dstW + 0] =

  561.     (*filterPos)[dstW + 1] =

  562.     (*filterPos)[dstW + 2] = (*filterPos)[dstW - 1]; /* the MMX/SSE scaler will

  563.                                                       * read over the end */

  564.     for (i = 0; i < *outFilterSize; i++) {

  565.         int k = (dstW - 1) * (*outFilterSize) + i;

  566.         (*outFilter)[k + 1 * (*outFilterSize)] =

  567.         (*outFilter)[k + 2 * (*outFilterSize)] =

  568.         (*outFilter)[k + 3 * (*outFilterSize)] = (*outFilter)[k];

  569.     }

  570. 

  571.     ret = 0;

  572. 

  573. fail:

  574.     av_free(filter);

  575.     av_free(filter2);

  576.     return ret;

  577. }

  578. 

  579. #if HAVE_MMX2

  580. static int initMMX2HScaler(int dstW, int xInc, uint8_t *filterCode,

  581.                            int16_t *filter, int32_t *filterPos, int numSplits)

  582. {

  583.     uint8_t *fragmentA;

  584.     x86_reg imm8OfPShufW1A;

  585.     x86_reg imm8OfPShufW2A;

  586.     x86_reg fragmentLengthA;

  587.     uint8_t *fragmentB;

  588.     x86_reg imm8OfPShufW1B;

  589.     x86_reg imm8OfPShufW2B;

  590.     x86_reg fragmentLengthB;

  591.     int fragmentPos;

  592. 

  593.     int xpos, i;

  594. 

  595.     // create an optimized horizontal scaling routine

  596.     /* This scaler is made of runtime-generated MMX2 code using specially tuned

  597.      * pshufw instructions. For every four output pixels, if four input pixels

  598.      * are enough for the fast bilinear scaling, then a chunk of fragmentB is

  599.      * used. If five input pixels are needed, then a chunk of fragmentA is used.

  600.      */

  601. 

  602.     // code fragment

  603. 

  604.     __asm__ volatile (

  605.         "jmp                         9f                 \n\t"

  606.         // Begin

  607.         "0:                                             \n\t"

  608.         "movq    (%%"REG_d", %%"REG_a"), %%mm3          \n\t"

  609.         "movd    (%%"REG_c", %%"REG_S"), %%mm0          \n\t"

  610.         "movd   1(%%"REG_c", %%"REG_S"), %%mm1          \n\t"

  611.         "punpcklbw                %%mm7, %%mm1          \n\t"

  612.         "punpcklbw                %%mm7, %%mm0          \n\t"

  613.         "pshufw                   $0xFF, %%mm1, %%mm1   \n\t"

  614.         "1:                                             \n\t"

  615.         "pshufw                   $0xFF, %%mm0, %%mm0   \n\t"

  616.         "2:                                             \n\t"

  617.         "psubw                    %%mm1, %%mm0          \n\t"

  618.         "movl   8(%%"REG_b", %%"REG_a"), %%esi          \n\t"

  619.         "pmullw                   %%mm3, %%mm0          \n\t"

  620.         "psllw                       $7, %%mm1          \n\t"

  621.         "paddw                    %%mm1, %%mm0          \n\t"

  622. 

  623.         "movq                     %%mm0, (%%"REG_D", %%"REG_a") \n\t"

  624. 

  625.         "add                         $8, %%"REG_a"      \n\t"

  626.         // End

  627.         "9:                                             \n\t"

  628.         // "int $3                                         \n\t"

  629.         "lea       " LOCAL_MANGLE(0b) ", %0             \n\t"

  630.         "lea       " LOCAL_MANGLE(1b) ", %1             \n\t"

  631.         "lea       " LOCAL_MANGLE(2b) ", %2             \n\t"

  632.         "dec                         %1                 \n\t"

  633.         "dec                         %2                 \n\t"

  634.         "sub                         %0, %1             \n\t"

  635.         "sub                         %0, %2             \n\t"

  636.         "lea       " LOCAL_MANGLE(9b) ", %3             \n\t"

  637.         "sub                         %0, %3             \n\t"

  638. 

  639. 

  640.         : "=r" (fragmentA), "=r" (imm8OfPShufW1A), "=r" (imm8OfPShufW2A),

  641.           "=r" (fragmentLengthA)

  642.         );

  643. 

  644.     __asm__ volatile (

  645.         "jmp                         9f                 \n\t"

  646.         // Begin

  647.         "0:                                             \n\t"

  648.         "movq    (%%"REG_d", %%"REG_a"), %%mm3          \n\t"

  649.         "movd    (%%"REG_c", %%"REG_S"), %%mm0          \n\t"

  650.         "punpcklbw                %%mm7, %%mm0          \n\t"

  651.         "pshufw                   $0xFF, %%mm0, %%mm1   \n\t"

  652.         "1:                                             \n\t"

  653.         "pshufw                   $0xFF, %%mm0, %%mm0   \n\t"

  654.         "2:                                             \n\t"

  655.         "psubw                    %%mm1, %%mm0          \n\t"

  656.         "movl   8(%%"REG_b", %%"REG_a"), %%esi          \n\t"

  657.         "pmullw                   %%mm3, %%mm0          \n\t"

  658.         "psllw                       $7, %%mm1          \n\t"

  659.         "paddw                    %%mm1, %%mm0          \n\t"

  660. 

  661.         "movq                     %%mm0, (%%"REG_D", %%"REG_a") \n\t"

  662. 

  663.         "add                         $8, %%"REG_a"      \n\t"

  664.         // End

  665.         "9:                                             \n\t"

  666.         // "int                       $3                   \n\t"

  667.         "lea       " LOCAL_MANGLE(0b) ", %0             \n\t"

  668.         "lea       " LOCAL_MANGLE(1b) ", %1             \n\t"

  669.         "lea       " LOCAL_MANGLE(2b) ", %2             \n\t"

  670.         "dec                         %1                 \n\t"

  671.         "dec                         %2                 \n\t"

  672.         "sub                         %0, %1             \n\t"

  673.         "sub                         %0, %2             \n\t"

  674.         "lea       " LOCAL_MANGLE(9b) ", %3             \n\t"

  675.         "sub                         %0, %3             \n\t"

  676. 

  677. 

  678.         : "=r" (fragmentB), "=r" (imm8OfPShufW1B), "=r" (imm8OfPShufW2B),

  679.           "=r" (fragmentLengthB)

  680.         );

  681. 

  682.     xpos        = 0; // lumXInc/2 - 0x8000; // difference between pixel centers

  683.     fragmentPos = 0;

  684. 

  685.     for (i = 0; i < dstW / numSplits; i++) {

  686.         int xx = xpos >> 16;

  687. 

  688.         if ((i & 3) == 0) {

  689.             int a                  = 0;

  690.             int b                  = ((xpos + xInc) >> 16) - xx;

  691.             int c                  = ((xpos + xInc * 2) >> 16) - xx;

  692.             int d                  = ((xpos + xInc * 3) >> 16) - xx;

  693.             int inc                = (d + 1 < 4);

  694.             uint8_t *fragment      = (d + 1 < 4) ? fragmentB : fragmentA;

  695.             x86_reg imm8OfPShufW1  = (d + 1 < 4) ? imm8OfPShufW1B : imm8OfPShufW1A;

  696.             x86_reg imm8OfPShufW2  = (d + 1 < 4) ? imm8OfPShufW2B : imm8OfPShufW2A;

  697.             x86_reg fragmentLength = (d + 1 < 4) ? fragmentLengthB : fragmentLengthA;

  698.             int maxShift           = 3 - (d + inc);

  699.             int shift              = 0;

  700. 

  701.             if (filterCode) {

  702.                 filter[i]        = ((xpos              & 0xFFFF) ^ 0xFFFF) >> 9;

  703.                 filter[i + 1]    = (((xpos + xInc)     & 0xFFFF) ^ 0xFFFF) >> 9;

  704.                 filter[i + 2]    = (((xpos + xInc * 2) & 0xFFFF) ^ 0xFFFF) >> 9;

  705.                 filter[i + 3]    = (((xpos + xInc * 3) & 0xFFFF) ^ 0xFFFF) >> 9;

  706.                 filterPos[i / 2] = xx;

  707. 

  708.                 memcpy(filterCode + fragmentPos, fragment, fragmentLength);

  709. 

  710.                 filterCode[fragmentPos + imm8OfPShufW1] =  (a + inc)       |

  711.                                                           ((b + inc) << 2) |

  712.                                                           ((c + inc) << 4) |

  713.                                                           ((d + inc) << 6);

  714.                 filterCode[fragmentPos + imm8OfPShufW2] =  a | (b << 2) |

  715.                                                                (c << 4) |

  716.                                                                (d << 6);

  717. 

  718.                 if (i + 4 - inc >= dstW)

  719.                     shift = maxShift;               // avoid overread

  720.                 else if ((filterPos[i / 2] & 3) <= maxShift)

  721.                     shift = filterPos[i / 2] & 3;   // align

  722. 

  723.                 if (shift && i >= shift) {

  724.                     filterCode[fragmentPos + imm8OfPShufW1] += 0x55 * shift;

  725.                     filterCode[fragmentPos + imm8OfPShufW2] += 0x55 * shift;

  726.                     filterPos[i / 2]                        -= shift;

  727.                 }

  728.             }

  729. 

  730.             fragmentPos += fragmentLength;

  731. 

  732.             if (filterCode)

  733.                 filterCode[fragmentPos] = RET;

  734.         }

  735.         xpos += xInc;

  736.     }

  737.     if (filterCode)

  738.         filterPos[((i / 2) + 1) & (~1)] = xpos >> 16;  // needed to jump to the next part

  739. 

  740.     return fragmentPos + 1;

  741. }

  742. #endif /* HAVE_MMX2 */

  743. 

  744. static void getSubSampleFactors(int *h, int *v, enum PixelFormat format)

  745. {

  746.     *h = av_pix_fmt_descriptors[format].log2_chroma_w;

  747.     *v = av_pix_fmt_descriptors[format].log2_chroma_h;

  748. }

  749. 

  750. int sws_setColorspaceDetails(struct SwsContext *c, const int inv_table[4],

  751.                              int srcRange, const int table[4], int dstRange,

  752.                              int brightness, int contrast, int saturation)

  753. {

  754.     memcpy(c->srcColorspaceTable, inv_table, sizeof(int) * 4);

  755.     memcpy(c->dstColorspaceTable, table, sizeof(int) * 4);

  756. 

  757.     c->brightness = brightness;

  758.     c->contrast   = contrast;

  759.     c->saturation = saturation;

  760.     c->srcRange   = srcRange;

  761.     c->dstRange   = dstRange;

  762.     if (isYUV(c->dstFormat) || isGray(c->dstFormat))

  763.         return -1;

  764. 

  765.     c->dstFormatBpp = av_get_bits_per_pixel(&av_pix_fmt_descriptors[c->dstFormat]);

  766.     c->srcFormatBpp = av_get_bits_per_pixel(&av_pix_fmt_descriptors[c->srcFormat]);

  767. 

  768.     ff_yuv2rgb_c_init_tables(c, inv_table, srcRange, brightness,

  769.                              contrast, saturation);

  770.     // FIXME factorize

  771. 

  772.     if (HAVE_ALTIVEC && av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC)

  773.         ff_yuv2rgb_init_tables_altivec(c, inv_table, brightness,

  774.                                        contrast, saturation);

  775.     return 0;

  776. }

  777. 

  778. int sws_getColorspaceDetails(struct SwsContext *c, int **inv_table,

  779.                              int *srcRange, int **table, int *dstRange,

  780.                              int *brightness, int *contrast, int *saturation)

  781. {

  782.     if (isYUV(c->dstFormat) || isGray(c->dstFormat))

  783.         return -1;

  784. 

  785.     *inv_table  = c->srcColorspaceTable;

  786.     *table      = c->dstColorspaceTable;

  787.     *srcRange   = c->srcRange;

  788.     *dstRange   = c->dstRange;

  789.     *brightness = c->brightness;

  790.     *contrast   = c->contrast;

  791.     *saturation = c->saturation;

  792. 

  793.     return 0;

  794. }

  795. 

  796. static int handle_jpeg(enum PixelFormat *format)

  797. {

  798.     switch (*format) {

  799.     case PIX_FMT_YUVJ420P:

  800.         *format = PIX_FMT_YUV420P;

  801.         return 1;

  802.     case PIX_FMT_YUVJ422P:

  803.         *format = PIX_FMT_YUV422P;

  804.         return 1;

  805.     case PIX_FMT_YUVJ444P:

  806.         *format = PIX_FMT_YUV444P;

  807.         return 1;

  808.     case PIX_FMT_YUVJ440P:

  809.         *format = PIX_FMT_YUV440P;

  810.         return 1;

  811.     default:

  812.         return 0;

  813.     }

  814. }

  815. 

  816. SwsContext *sws_alloc_context(void)

  817. {

  818.     SwsContext *c = av_mallocz(sizeof(SwsContext));

  819. 

  820.     c->av_class = &sws_context_class;

  821.     av_opt_set_defaults(c);

  822. 

  823.     return c;

  824. }

  825. 

  826. int sws_init_context(SwsContext *c, SwsFilter *srcFilter, SwsFilter *dstFilter)

  827. {

  828.     int i;

  829.     int usesVFilter, usesHFilter;

  830.     int unscaled;

  831.     SwsFilter dummyFilter = { NULL, NULL, NULL, NULL };

  832.     int srcW              = c->srcW;

  833.     int srcH              = c->srcH;

  834.     int dstW              = c->dstW;

  835.     int dstH              = c->dstH;

  836.     int dst_stride        = FFALIGN(dstW * sizeof(int16_t) + 16, 16);

  837.     int dst_stride_px     = dst_stride >> 1;

  838.     int flags, cpu_flags;

  839.     enum PixelFormat srcFormat = c->srcFormat;

  840.     enum PixelFormat dstFormat = c->dstFormat;

  841. 

  842.     cpu_flags = av_get_cpu_flags();

  843.     flags     = c->flags;

  844.     emms_c();

  845.     if (!rgb15to16)

  846.         sws_rgb2rgb_init();

  847. 

  848.     unscaled = (srcW == dstW && srcH == dstH);

  849. 

  850.     if (!sws_isSupportedInput(srcFormat)) {

  851.         av_log(c, AV_LOG_ERROR, "%s is not supported as input pixel format\n",

  852.                sws_format_name(srcFormat));

  853.         return AVERROR(EINVAL);

  854.     }

  855.     if (!sws_isSupportedOutput(dstFormat)) {

  856.         av_log(c, AV_LOG_ERROR, "%s is not supported as output pixel format\n",

  857.                sws_format_name(dstFormat));

  858.         return AVERROR(EINVAL);

  859.     }

  860. 

  861.     i = flags & (SWS_POINT         |

  862.                  SWS_AREA          |

  863.                  SWS_BILINEAR      |

  864.                  SWS_FAST_BILINEAR |

  865.                  SWS_BICUBIC       |

  866.                  SWS_X             |

  867.                  SWS_GAUSS         |

  868.                  SWS_LANCZOS       |

  869.                  SWS_SINC          |

  870.                  SWS_SPLINE        |

  871.                  SWS_BICUBLIN);

  872.     if (!i || (i & (i - 1))) {

  873.         av_log(c, AV_LOG_ERROR,

  874.                "Exactly one scaler algorithm must be chosen\n");

  875.         return AVERROR(EINVAL);

  876.     }

  877.     /* sanity check */

  878.     if (srcW < 4 || srcH < 1 || dstW < 8 || dstH < 1) {

  879.         /* FIXME check if these are enough and try to lower them after

  880.          * fixing the relevant parts of the code */

  881.         av_log(c, AV_LOG_ERROR, "%dx%d -> %dx%d is invalid scaling dimension\n",

  882.                srcW, srcH, dstW, dstH);

  883.         return AVERROR(EINVAL);

  884.     }

  885. 

  886.     if (!dstFilter)

  887.         dstFilter = &dummyFilter;

  888.     if (!srcFilter)

  889.         srcFilter = &dummyFilter;

  890. 

  891.     c->lumXInc      = (((int64_t)srcW << 16) + (dstW >> 1)) / dstW;

  892.     c->lumYInc      = (((int64_t)srcH << 16) + (dstH >> 1)) / dstH;

  893.     c->dstFormatBpp = av_get_bits_per_pixel(&av_pix_fmt_descriptors[dstFormat]);

  894.     c->srcFormatBpp = av_get_bits_per_pixel(&av_pix_fmt_descriptors[srcFormat]);

  895.     c->vRounder     = 4 * 0x0001000100010001ULL;

  896. 

  897.     usesVFilter = (srcFilter->lumV && srcFilter->lumV->length > 1) ||

  898.                   (srcFilter->chrV && srcFilter->chrV->length > 1) ||

  899.                   (dstFilter->lumV && dstFilter->lumV->length > 1) ||

  900.                   (dstFilter->chrV && dstFilter->chrV->length > 1);

  901.     usesHFilter = (srcFilter->lumH && srcFilter->lumH->length > 1) ||

  902.                   (srcFilter->chrH && srcFilter->chrH->length > 1) ||

  903.                   (dstFilter->lumH && dstFilter->lumH->length > 1) ||

  904.                   (dstFilter->chrH && dstFilter->chrH->length > 1);

  905. 

  906.     getSubSampleFactors(&c->chrSrcHSubSample, &c->chrSrcVSubSample, srcFormat);

  907.     getSubSampleFactors(&c->chrDstHSubSample, &c->chrDstVSubSample, dstFormat);

  908. 

  909.     /* reuse chroma for 2 pixels RGB/BGR unless user wants full

  910.      * chroma interpolation */

  911.     if (flags & SWS_FULL_CHR_H_INT &&

  912.         isAnyRGB(dstFormat)        &&

  913.         dstFormat != PIX_FMT_RGBA  &&

  914.         dstFormat != PIX_FMT_ARGB  &&

  915.         dstFormat != PIX_FMT_BGRA  &&

  916.         dstFormat != PIX_FMT_ABGR  &&

  917.         dstFormat != PIX_FMT_RGB24 &&

  918.         dstFormat != PIX_FMT_BGR24) {

  919.         av_log(c, AV_LOG_ERROR,

  920.                "full chroma interpolation for destination format '%s' not yet implemented\n",

  921.                sws_format_name(dstFormat));

  922.         flags   &= ~SWS_FULL_CHR_H_INT;

  923.         c->flags = flags;

  924.     }

  925.     if (isAnyRGB(dstFormat) && !(flags & SWS_FULL_CHR_H_INT))

  926.         c->chrDstHSubSample = 1;

  927. 

  928.     // drop some chroma lines if the user wants it

  929.     c->vChrDrop          = (flags & SWS_SRC_V_CHR_DROP_MASK) >>

  930.                            SWS_SRC_V_CHR_DROP_SHIFT;

  931.     c->chrSrcVSubSample += c->vChrDrop;

  932. 

  933.     /* drop every other pixel for chroma calculation unless user

  934.      * wants full chroma */

  935.     if (isAnyRGB(srcFormat) && !(flags & SWS_FULL_CHR_H_INP)   &&

  936.         srcFormat != PIX_FMT_RGB8 && srcFormat != PIX_FMT_BGR8 &&

  937.         srcFormat != PIX_FMT_RGB4 && srcFormat != PIX_FMT_BGR4 &&

  938.         srcFormat != PIX_FMT_RGB4_BYTE && srcFormat != PIX_FMT_BGR4_BYTE &&

  939.         ((dstW >> c->chrDstHSubSample) <= (srcW >> 1) ||

  940.          (flags & SWS_FAST_BILINEAR)))

  941.         c->chrSrcHSubSample = 1;

  942. 

  943.     // Note the -((-x)>>y) is so that we always round toward +inf.

  944.     c->chrSrcW = -((-srcW) >> c->chrSrcHSubSample);

  945.     c->chrSrcH = -((-srcH) >> c->chrSrcVSubSample);

  946.     c->chrDstW = -((-dstW) >> c->chrDstHSubSample);

  947.     c->chrDstH = -((-dstH) >> c->chrDstVSubSample);

  948. 

  949.     /* unscaled special cases */

  950.     if (unscaled && !usesHFilter && !usesVFilter &&

  951.         (c->srcRange == c->dstRange || isAnyRGB(dstFormat))) {

  952.         ff_get_unscaled_swscale(c);

  953. 

  954.         if (c->swScale) {

  955.             if (flags & SWS_PRINT_INFO)

  956.                 av_log(c, AV_LOG_INFO,

  957.                        "using unscaled %s -> %s special converter\n",

  958.                        sws_format_name(srcFormat), sws_format_name(dstFormat));

  959.             return 0;

  960.         }

  961.     }

  962. 

  963.     c->srcBpc = 1 + av_pix_fmt_descriptors[srcFormat].comp[0].depth_minus1;

  964.     if (c->srcBpc < 8)

  965.         c->srcBpc = 8;

  966.     c->dstBpc = 1 + av_pix_fmt_descriptors[dstFormat].comp[0].depth_minus1;

  967.     if (c->dstBpc < 8)

  968.         c->dstBpc = 8;

  969.     if (c->dstBpc == 16)

  970.         dst_stride <<= 1;

  971.     FF_ALLOC_OR_GOTO(c, c->formatConvBuffer,

  972.                      (FFALIGN(srcW, 16) * 2 * FFALIGN(c->srcBpc, 8) >> 3) + 16,

  973.                      fail);

  974.     if (HAVE_MMX2 && cpu_flags & AV_CPU_FLAG_MMX2 &&

  975.         c->srcBpc == 8 && c->dstBpc <= 10) {

  976.         c->canMMX2BeUsed = (dstW >= srcW && (dstW & 31) == 0 &&

  977.                             (srcW & 15) == 0) ? 1 : 0;

  978.         if (!c->canMMX2BeUsed && dstW >= srcW && (srcW & 15) == 0

  979.             && (flags & SWS_FAST_BILINEAR)) {

  980.             if (flags & SWS_PRINT_INFO)

  981.                 av_log(c, AV_LOG_INFO,

  982.                        "output width is not a multiple of 32 -> no MMX2 scaler\n");

  983.         }

  984.         if (usesHFilter)

  985.             c->canMMX2BeUsed = 0;

  986.     } else

  987.         c->canMMX2BeUsed = 0;

  988. 

  989.     c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;

  990.     c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;

  991. 

  992.     /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src

  993.      * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do

  994.      * correct scaling.

  995.      * n-2 is the last chrominance sample available.

  996.      * This is not perfect, but no one should notice the difference, the more

  997.      * correct variant would be like the vertical one, but that would require

  998.      * some special code for the first and last pixel */

  999.     if (flags & SWS_FAST_BILINEAR) {

  1000.         if (c->canMMX2BeUsed) {

  1001.             c->lumXInc += 20;

  1002.             c->chrXInc += 20;

  1003.         }

  1004.         // we don't use the x86 asm scaler if MMX is available

  1005.         else if (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) {

  1006.             c->lumXInc = ((int64_t)(srcW       - 2) << 16) / (dstW       - 2) - 20;

  1007.             c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;

  1008.         }

  1009.     }

  1010. 

  1011.     /* precalculate horizontal scaler filter coefficients */

  1012.     {

  1013. #if HAVE_MMX2

  1014. // can't downscale !!!

  1015.         if (c->canMMX2BeUsed && (flags & SWS_FAST_BILINEAR)) {

  1016.             c->lumMmx2FilterCodeSize = initMMX2HScaler(dstW, c->lumXInc, NULL,

  1017.                                                        NULL, NULL, 8);

  1018.             c->chrMmx2FilterCodeSize = initMMX2HScaler(c->chrDstW, c->chrXInc,

  1019.                                                        NULL, NULL, NULL, 4);

  1020. 

  1021. #ifdef MAP_ANONYMOUS

  1022.             c->lumMmx2FilterCode = mmap(NULL, c->lumMmx2FilterCodeSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);

  1023.             c->chrMmx2FilterCode = mmap(NULL, c->chrMmx2FilterCodeSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);

  1024. #elif HAVE_VIRTUALALLOC

  1025.             c->lumMmx2FilterCode = VirtualAlloc(NULL, c->lumMmx2FilterCodeSize, MEM_COMMIT, PAGE_EXECUTE_READWRITE);

  1026.             c->chrMmx2FilterCode = VirtualAlloc(NULL, c->chrMmx2FilterCodeSize, MEM_COMMIT, PAGE_EXECUTE_READWRITE);

  1027. #else

  1028.             c->lumMmx2FilterCode = av_malloc(c->lumMmx2FilterCodeSize);

  1029.             c->chrMmx2FilterCode = av_malloc(c->chrMmx2FilterCodeSize);

  1030. #endif

  1031. 

  1032.             if (!c->lumMmx2FilterCode || !c->chrMmx2FilterCode)

  1033.                 return AVERROR(ENOMEM);

  1034.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilter,    (dstW           / 8 + 8) * sizeof(int16_t), fail);

  1035.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilter,    (c->chrDstW     / 4 + 8) * sizeof(int16_t), fail);

  1036.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW       / 2 / 8 + 8) * sizeof(int32_t), fail);

  1037.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);

  1038. 

  1039.             initMMX2HScaler(dstW, c->lumXInc, c->lumMmx2FilterCode,

  1040.                             c->hLumFilter, c->hLumFilterPos, 8);

  1041.             initMMX2HScaler(c->chrDstW, c->chrXInc, c->chrMmx2FilterCode,

  1042.                             c->hChrFilter, c->hChrFilterPos, 4);

  1043. 

  1044. #ifdef MAP_ANONYMOUS

  1045.             mprotect(c->lumMmx2FilterCode, c->lumMmx2FilterCodeSize, PROT_EXEC | PROT_READ);

  1046.             mprotect(c->chrMmx2FilterCode, c->chrMmx2FilterCodeSize, PROT_EXEC | PROT_READ);

  1047. #endif

  1048.         } else

  1049. #endif /* HAVE_MMX2 */

  1050.         {

  1051.             const int filterAlign =

  1052.                 (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? 4 :

  1053.                 (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) ? 8 :

  1054.                 1;

  1055. 

  1056.             if (initFilter(&c->hLumFilter, &c->hLumFilterPos,

  1057.                            &c->hLumFilterSize, c->lumXInc,

  1058.                            srcW, dstW, filterAlign, 1 << 14,

  1059.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1060.                            cpu_flags, srcFilter->lumH, dstFilter->lumH,

  1061.                            c->param, 1) < 0)

  1062.                 goto fail;

  1063.             if (initFilter(&c->hChrFilter, &c->hChrFilterPos,

  1064.                            &c->hChrFilterSize, c->chrXInc,

  1065.                            c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,

  1066.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1067.                            cpu_flags, srcFilter->chrH, dstFilter->chrH,

  1068.                            c->param, 1) < 0)

  1069.                 goto fail;

  1070.         }

  1071.     } // initialize horizontal stuff

  1072. 

  1073.     /* precalculate vertical scaler filter coefficients */

  1074.     {

  1075.         const int filterAlign =

  1076.             (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? 2 :

  1077.             (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) ? 8 :

  1078.             1;

  1079. 

  1080.         if (initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,

  1081.                        c->lumYInc, srcH, dstH, filterAlign, (1 << 12),

  1082.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1083.                        cpu_flags, srcFilter->lumV, dstFilter->lumV,

  1084.                        c->param, 0) < 0)

  1085.             goto fail;

  1086.         if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,

  1087.                        c->chrYInc, c->chrSrcH, c->chrDstH,

  1088.                        filterAlign, (1 << 12),

  1089.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1090.                        cpu_flags, srcFilter->chrV, dstFilter->chrV,

  1091.                        c->param, 0) < 0)

  1092.             goto fail;

  1093. 

  1094. #if HAVE_ALTIVEC

  1095.         FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH,    fail);

  1096.         FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);

  1097. 

  1098.         for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {

  1099.             int j;

  1100.             short *p = (short *)&c->vYCoeffsBank[i];

  1101.             for (j = 0; j < 8; j++)

  1102.                 p[j] = c->vLumFilter[i];

  1103.         }

  1104. 

  1105.         for (i = 0; i < c->vChrFilterSize * c->chrDstH; i++) {

  1106.             int j;

  1107.             short *p = (short *)&c->vCCoeffsBank[i];

  1108.             for (j = 0; j < 8; j++)

  1109.                 p[j] = c->vChrFilter[i];

  1110.         }

  1111. #endif

  1112.     }

  1113. 

  1114.     // calculate buffer sizes so that they won't run out while handling these damn slices

  1115.     c->vLumBufSize = c->vLumFilterSize;

  1116.     c->vChrBufSize = c->vChrFilterSize;

  1117.     for (i = 0; i < dstH; i++) {

  1118.         int chrI      = (int64_t)i * c->chrDstH / dstH;

  1119.         int nextSlice = FFMAX(c->vLumFilterPos[i] + c->vLumFilterSize - 1,

  1120.                               ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)

  1121.                                << c->chrSrcVSubSample));

  1122. 

  1123.         nextSlice >>= c->chrSrcVSubSample;

  1124.         nextSlice <<= c->chrSrcVSubSample;

  1125.         if (c->vLumFilterPos[i] + c->vLumBufSize < nextSlice)

  1126.             c->vLumBufSize = nextSlice - c->vLumFilterPos[i];

  1127.         if (c->vChrFilterPos[chrI] + c->vChrBufSize <

  1128.             (nextSlice >> c->chrSrcVSubSample))

  1129.             c->vChrBufSize = (nextSlice >> c->chrSrcVSubSample) -

  1130.                              c->vChrFilterPos[chrI];

  1131.     }

  1132. 

  1133.     /* Allocate pixbufs (we use dynamic allocation because otherwise we would

  1134.      * need to allocate several megabytes to handle all possible cases) */

  1135.     FF_ALLOC_OR_GOTO(c, c->lumPixBuf,  c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1136.     FF_ALLOC_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1137.     FF_ALLOC_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1138.     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))

  1139.         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1140.     /* Note we need at least one pixel more at the end because of the MMX code

  1141.      * (just in case someone wants to replace the 4000/8000). */

  1142.     /* align at 16 bytes for AltiVec */

  1143.     for (i = 0; i < c->vLumBufSize; i++) {

  1144.         FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i + c->vLumBufSize],

  1145.                           dst_stride + 16, fail);

  1146.         c->lumPixBuf[i] = c->lumPixBuf[i + c->vLumBufSize];

  1147.     }

  1148.     // 64 / (c->dstBpc & ~7) is the same as 16 / sizeof(scaling_intermediate)

  1149.     c->uv_off_px   = dst_stride_px + 64 / (c->dstBpc & ~7);

  1150.     c->uv_off_byte = dst_stride + 16;

  1151.     for (i = 0; i < c->vChrBufSize; i++) {

  1152.         FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],

  1153.                          dst_stride * 2 + 32, fail);

  1154.         c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];

  1155.         c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]

  1156.                          = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;

  1157.     }

  1158.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

  1159.         for (i = 0; i < c->vLumBufSize; i++) {

  1160.             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i + c->vLumBufSize],

  1161.                               dst_stride + 16, fail);

  1162.             c->alpPixBuf[i] = c->alpPixBuf[i + c->vLumBufSize];

  1163.         }

  1164. 

  1165.     // try to avoid drawing green stuff between the right end and the stride end

  1166.     for (i = 0; i < c->vChrBufSize; i++)

  1167.         memset(c->chrUPixBuf[i], 64, dst_stride * 2 + 1);

  1168. 

  1169.     assert(c->chrDstH <= dstH);

  1170. 

  1171.     if (flags & SWS_PRINT_INFO) {

  1172.         if (flags & SWS_FAST_BILINEAR)

  1173.             av_log(c, AV_LOG_INFO, "FAST_BILINEAR scaler, ");

  1174.         else if (flags & SWS_BILINEAR)

  1175.             av_log(c, AV_LOG_INFO, "BILINEAR scaler, ");

  1176.         else if (flags & SWS_BICUBIC)

  1177.             av_log(c, AV_LOG_INFO, "BICUBIC scaler, ");

  1178.         else if (flags & SWS_X)

  1179.             av_log(c, AV_LOG_INFO, "Experimental scaler, ");

  1180.         else if (flags & SWS_POINT)

  1181.             av_log(c, AV_LOG_INFO, "Nearest Neighbor / POINT scaler, ");

  1182.         else if (flags & SWS_AREA)

  1183.             av_log(c, AV_LOG_INFO, "Area Averaging scaler, ");

  1184.         else if (flags & SWS_BICUBLIN)

  1185.             av_log(c, AV_LOG_INFO, "luma BICUBIC / chroma BILINEAR scaler, ");

  1186.         else if (flags & SWS_GAUSS)

  1187.             av_log(c, AV_LOG_INFO, "Gaussian scaler, ");

  1188.         else if (flags & SWS_SINC)

  1189.             av_log(c, AV_LOG_INFO, "Sinc scaler, ");

  1190.         else if (flags & SWS_LANCZOS)

  1191.             av_log(c, AV_LOG_INFO, "Lanczos scaler, ");

  1192.         else if (flags & SWS_SPLINE)

  1193.             av_log(c, AV_LOG_INFO, "Bicubic spline scaler, ");

  1194.         else

  1195.             av_log(c, AV_LOG_INFO, "ehh flags invalid?! ");

  1196. 

  1197.         av_log(c, AV_LOG_INFO, "from %s to %s%s ",

  1198.                sws_format_name(srcFormat),

  1199. #ifdef DITHER1XBPP

  1200.                dstFormat == PIX_FMT_BGR555   || dstFormat == PIX_FMT_BGR565   ||

  1201.                dstFormat == PIX_FMT_RGB444BE || dstFormat == PIX_FMT_RGB444LE ||

  1202.                dstFormat == PIX_FMT_BGR444BE || dstFormat == PIX_FMT_BGR444LE ?

  1203.                                                              "dithered " : "",

  1204. #else

  1205.                "",

  1206. #endif

  1207.                sws_format_name(dstFormat));

  1208. 

  1209.         if (HAVE_MMX2 && cpu_flags & AV_CPU_FLAG_MMX2)

  1210.             av_log(c, AV_LOG_INFO, "using MMX2\n");

  1211.         else if (HAVE_AMD3DNOW && cpu_flags & AV_CPU_FLAG_3DNOW)

  1212.             av_log(c, AV_LOG_INFO, "using 3DNOW\n");

  1213.         else if (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX)

  1214.             av_log(c, AV_LOG_INFO, "using MMX\n");

  1215.         else if (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC)

  1216.             av_log(c, AV_LOG_INFO, "using AltiVec\n");

  1217.         else

  1218.             av_log(c, AV_LOG_INFO, "using C\n");

  1219. 

  1220.         av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1221.         av_log(c, AV_LOG_DEBUG,

  1222.                "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1223.                c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);

  1224.         av_log(c, AV_LOG_DEBUG,

  1225.                "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1226.                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,

  1227.                c->chrXInc, c->chrYInc);

  1228.     }

  1229. 

  1230.     c->swScale = ff_getSwsFunc(c);

  1231.     return 0;

  1232. fail: // FIXME replace things by appropriate error codes

  1233.     return -1;

  1234. }

  1235. 

  1236. #if FF_API_SWS_GETCONTEXT

  1237. SwsContext *sws_getContext(int srcW, int srcH, enum PixelFormat srcFormat,

  1238.                            int dstW, int dstH, enum PixelFormat dstFormat,

  1239.                            int flags, SwsFilter *srcFilter,

  1240.                            SwsFilter *dstFilter, const double *param)

  1241. {

  1242.     SwsContext *c;

  1243. 

  1244.     if (!(c = sws_alloc_context()))

  1245.         return NULL;

  1246. 

  1247.     c->flags     = flags;

  1248.     c->srcW      = srcW;

  1249.     c->srcH      = srcH;

  1250.     c->dstW      = dstW;

  1251.     c->dstH      = dstH;

  1252.     c->srcRange  = handle_jpeg(&srcFormat);

  1253.     c->dstRange  = handle_jpeg(&dstFormat);

  1254.     c->srcFormat = srcFormat;

  1255.     c->dstFormat = dstFormat;

  1256. 

  1257.     if (param) {

  1258.         c->param[0] = param[0];

  1259.         c->param[1] = param[1];

  1260.     }

  1261.     sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,

  1262.                              ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  1263.                              c->dstRange, 0, 1 << 16, 1 << 16);

  1264. 

  1265.     if (sws_init_context(c, srcFilter, dstFilter) < 0) {

  1266.         sws_freeContext(c);

  1267.         return NULL;

  1268.     }

  1269. 

  1270.     return c;

  1271. }

  1272. #endif

  1273. 

  1274. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,

  1275.                                 float lumaSharpen, float chromaSharpen,

  1276.                                 float chromaHShift, float chromaVShift,

  1277.                                 int verbose)

  1278. {

  1279.     SwsFilter *filter = av_malloc(sizeof(SwsFilter));

  1280.     if (!filter)

  1281.         return NULL;

  1282. 

  1283.     if (lumaGBlur != 0.0) {

  1284.         filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);

  1285.         filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);

  1286.     } else {

  1287.         filter->lumH = sws_getIdentityVec();

  1288.         filter->lumV = sws_getIdentityVec();

  1289.     }

  1290. 

  1291.     if (chromaGBlur != 0.0) {

  1292.         filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);

  1293.         filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);

  1294.     } else {

  1295.         filter->chrH = sws_getIdentityVec();

  1296.         filter->chrV = sws_getIdentityVec();

  1297.     }

  1298. 

  1299.     if (chromaSharpen != 0.0) {

  1300.         SwsVector *id = sws_getIdentityVec();

  1301.         sws_scaleVec(filter->chrH, -chromaSharpen);

  1302.         sws_scaleVec(filter->chrV, -chromaSharpen);

  1303.         sws_addVec(filter->chrH, id);

  1304.         sws_addVec(filter->chrV, id);

  1305.         sws_freeVec(id);

  1306.     }

  1307. 

  1308.     if (lumaSharpen != 0.0) {

  1309.         SwsVector *id = sws_getIdentityVec();

  1310.         sws_scaleVec(filter->lumH, -lumaSharpen);

  1311.         sws_scaleVec(filter->lumV, -lumaSharpen);

  1312.         sws_addVec(filter->lumH, id);

  1313.         sws_addVec(filter->lumV, id);

  1314.         sws_freeVec(id);

  1315.     }

  1316. 

  1317.     if (chromaHShift != 0.0)

  1318.         sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));

  1319. 

  1320.     if (chromaVShift != 0.0)

  1321.         sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));

  1322. 

  1323.     sws_normalizeVec(filter->chrH, 1.0);

  1324.     sws_normalizeVec(filter->chrV, 1.0);

  1325.     sws_normalizeVec(filter->lumH, 1.0);

  1326.     sws_normalizeVec(filter->lumV, 1.0);

  1327. 

  1328.     if (verbose)

  1329.         sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);

  1330.     if (verbose)

  1331.         sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);

  1332. 

  1333.     return filter;

  1334. }

  1335. 

  1336. SwsVector *sws_allocVec(int length)

  1337. {

  1338.     SwsVector *vec = av_malloc(sizeof(SwsVector));

  1339.     if (!vec)

  1340.         return NULL;

  1341.     vec->length = length;

  1342.     vec->coeff  = av_malloc(sizeof(double) * length);

  1343.     if (!vec->coeff)

  1344.         av_freep(&vec);

  1345.     return vec;

  1346. }

  1347. 

  1348. SwsVector *sws_getGaussianVec(double variance, double quality)

  1349. {

  1350.     const int length = (int)(variance * quality + 0.5) | 1;

  1351.     int i;

  1352.     double middle  = (length - 1) * 0.5;

  1353.     SwsVector *vec = sws_allocVec(length);

  1354. 

  1355.     if (!vec)

  1356.         return NULL;

  1357. 

  1358.     for (i = 0; i < length; i++) {

  1359.         double dist = i - middle;

  1360.         vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /

  1361.                         sqrt(2 * variance * M_PI);

  1362.     }

  1363. 

  1364.     sws_normalizeVec(vec, 1.0);

  1365. 

  1366.     return vec;

  1367. }

  1368. 

  1369. SwsVector *sws_getConstVec(double c, int length)

  1370. {

  1371.     int i;

  1372.     SwsVector *vec = sws_allocVec(length);

  1373. 

  1374.     if (!vec)

  1375.         return NULL;

  1376. 

  1377.     for (i = 0; i < length; i++)

  1378.         vec->coeff[i] = c;

  1379. 

  1380.     return vec;

  1381. }

  1382. 

  1383. SwsVector *sws_getIdentityVec(void)

  1384. {

  1385.     return sws_getConstVec(1.0, 1);

  1386. }

  1387. 

  1388. static double sws_dcVec(SwsVector *a)

  1389. {

  1390.     int i;

  1391.     double sum = 0;

  1392. 

  1393.     for (i = 0; i < a->length; i++)

  1394.         sum += a->coeff[i];

  1395. 

  1396.     return sum;

  1397. }

  1398. 

  1399. void sws_scaleVec(SwsVector *a, double scalar)

  1400. {

  1401.     int i;

  1402. 

  1403.     for (i = 0; i < a->length; i++)

  1404.         a->coeff[i] *= scalar;

  1405. }

  1406. 

  1407. void sws_normalizeVec(SwsVector *a, double height)

  1408. {

  1409.     sws_scaleVec(a, height / sws_dcVec(a));

  1410. }

  1411. 

  1412. static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)

  1413. {

  1414.     int length = a->length + b->length - 1;

  1415.     int i, j;

  1416.     SwsVector *vec = sws_getConstVec(0.0, length);

  1417. 

  1418.     if (!vec)

  1419.         return NULL;

  1420. 

  1421.     for (i = 0; i < a->length; i++) {

  1422.         for (j = 0; j < b->length; j++) {

  1423.             vec->coeff[i + j] += a->coeff[i] * b->coeff[j];

  1424.         }

  1425.     }

  1426. 

  1427.     return vec;

  1428. }

  1429. 

  1430. static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)

  1431. {

  1432.     int length = FFMAX(a->length, b->length);

  1433.     int i;

  1434.     SwsVector *vec = sws_getConstVec(0.0, length);

  1435. 

  1436.     if (!vec)

  1437.         return NULL;

  1438. 

  1439.     for (i = 0; i < a->length; i++)

  1440.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1441.     for (i = 0; i < b->length; i++)

  1442.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] += b->coeff[i];

  1443. 

  1444.     return vec;

  1445. }

  1446. 

  1447. static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)

  1448. {

  1449.     int length = FFMAX(a->length, b->length);

  1450.     int i;

  1451.     SwsVector *vec = sws_getConstVec(0.0, length);

  1452. 

  1453.     if (!vec)

  1454.         return NULL;

  1455. 

  1456.     for (i = 0; i < a->length; i++)

  1457.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1458.     for (i = 0; i < b->length; i++)

  1459.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] -= b->coeff[i];

  1460. 

  1461.     return vec;

  1462. }

  1463. 

  1464. /* shift left / or right if "shift" is negative */

  1465. static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)

  1466. {

  1467.     int length = a->length + FFABS(shift) * 2;

  1468.     int i;

  1469.     SwsVector *vec = sws_getConstVec(0.0, length);

  1470. 

  1471.     if (!vec)

  1472.         return NULL;

  1473. 

  1474.     for (i = 0; i < a->length; i++) {

  1475.         vec->coeff[i + (length    - 1) / 2 -

  1476.                        (a->length - 1) / 2 - shift] = a->coeff[i];

  1477.     }

  1478. 

  1479.     return vec;

  1480. }

  1481. 

  1482. void sws_shiftVec(SwsVector *a, int shift)

  1483. {

  1484.     SwsVector *shifted = sws_getShiftedVec(a, shift);

  1485.     av_free(a->coeff);

  1486.     a->coeff  = shifted->coeff;

  1487.     a->length = shifted->length;

  1488.     av_free(shifted);

  1489. }

  1490. 

  1491. void sws_addVec(SwsVector *a, SwsVector *b)

  1492. {

  1493.     SwsVector *sum = sws_sumVec(a, b);

  1494.     av_free(a->coeff);

  1495.     a->coeff  = sum->coeff;

  1496.     a->length = sum->length;

  1497.     av_free(sum);

  1498. }

  1499. 

  1500. void sws_subVec(SwsVector *a, SwsVector *b)

  1501. {

  1502.     SwsVector *diff = sws_diffVec(a, b);

  1503.     av_free(a->coeff);

  1504.     a->coeff  = diff->coeff;

  1505.     a->length = diff->length;

  1506.     av_free(diff);

  1507. }

  1508. 

  1509. void sws_convVec(SwsVector *a, SwsVector *b)

  1510. {

  1511.     SwsVector *conv = sws_getConvVec(a, b);

  1512.     av_free(a->coeff);

  1513.     a->coeff  = conv->coeff;

  1514.     a->length = conv->length;

  1515.     av_free(conv);

  1516. }

  1517. 

  1518. SwsVector *sws_cloneVec(SwsVector *a)

  1519. {

  1520.     int i;

  1521.     SwsVector *vec = sws_allocVec(a->length);

  1522. 

  1523.     if (!vec)

  1524.         return NULL;

  1525. 

  1526.     for (i = 0; i < a->length; i++)

  1527.         vec->coeff[i] = a->coeff[i];

  1528. 

  1529.     return vec;

  1530. }

  1531. 

  1532. void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)

  1533. {

  1534.     int i;

  1535.     double max = 0;

  1536.     double min = 0;

  1537.     double range;

  1538. 

  1539.     for (i = 0; i < a->length; i++)

  1540.         if (a->coeff[i] > max)

  1541.             max = a->coeff[i];

  1542. 

  1543.     for (i = 0; i < a->length; i++)

  1544.         if (a->coeff[i] < min)

  1545.             min = a->coeff[i];

  1546. 

  1547.     range = max - min;

  1548. 

  1549.     for (i = 0; i < a->length; i++) {

  1550.         int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);

  1551.         av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);

  1552.         for (; x > 0; x--)

  1553.             av_log(log_ctx, log_level, " ");

  1554.         av_log(log_ctx, log_level, "|\n");

  1555.     }

  1556. }

  1557. 

  1558. void sws_freeVec(SwsVector *a)

  1559. {

  1560.     if (!a)

  1561.         return;

  1562.     av_freep(&a->coeff);

  1563.     a->length = 0;

  1564.     av_free(a);

  1565. }

  1566. 

  1567. void sws_freeFilter(SwsFilter *filter)

  1568. {

  1569.     if (!filter)

  1570.         return;

  1571. 

  1572.     if (filter->lumH)

  1573.         sws_freeVec(filter->lumH);

  1574.     if (filter->lumV)

  1575.         sws_freeVec(filter->lumV);

  1576.     if (filter->chrH)

  1577.         sws_freeVec(filter->chrH);

  1578.     if (filter->chrV)

  1579.         sws_freeVec(filter->chrV);

  1580.     av_free(filter);

  1581. }

  1582. 

  1583. void sws_freeContext(SwsContext *c)

  1584. {

  1585.     int i;

  1586.     if (!c)

  1587.         return;

  1588. 

  1589.     if (c->lumPixBuf) {

  1590.         for (i = 0; i < c->vLumBufSize; i++)

  1591.             av_freep(&c->lumPixBuf[i]);

  1592.         av_freep(&c->lumPixBuf);

  1593.     }

  1594. 

  1595.     if (c->chrUPixBuf) {

  1596.         for (i = 0; i < c->vChrBufSize; i++)

  1597.             av_freep(&c->chrUPixBuf[i]);

  1598.         av_freep(&c->chrUPixBuf);

  1599.         av_freep(&c->chrVPixBuf);

  1600.     }

  1601. 

  1602.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

  1603.         for (i = 0; i < c->vLumBufSize; i++)

  1604.             av_freep(&c->alpPixBuf[i]);

  1605.         av_freep(&c->alpPixBuf);

  1606.     }

  1607. 

  1608.     av_freep(&c->vLumFilter);

  1609.     av_freep(&c->vChrFilter);

  1610.     av_freep(&c->hLumFilter);

  1611.     av_freep(&c->hChrFilter);

  1612. #if HAVE_ALTIVEC

  1613.     av_freep(&c->vYCoeffsBank);

  1614.     av_freep(&c->vCCoeffsBank);

  1615. #endif

  1616. 

  1617.     av_freep(&c->vLumFilterPos);

  1618.     av_freep(&c->vChrFilterPos);

  1619.     av_freep(&c->hLumFilterPos);

  1620.     av_freep(&c->hChrFilterPos);

  1621. 

  1622. #if HAVE_MMX

  1623. #ifdef MAP_ANONYMOUS

  1624.     if (c->lumMmx2FilterCode)

  1625.         munmap(c->lumMmx2FilterCode, c->lumMmx2FilterCodeSize);

  1626.     if (c->chrMmx2FilterCode)

  1627.         munmap(c->chrMmx2FilterCode, c->chrMmx2FilterCodeSize);

  1628. #elif HAVE_VIRTUALALLOC

  1629.     if (c->lumMmx2FilterCode)

  1630.         VirtualFree(c->lumMmx2FilterCode, 0, MEM_RELEASE);

  1631.     if (c->chrMmx2FilterCode)

  1632.         VirtualFree(c->chrMmx2FilterCode, 0, MEM_RELEASE);

  1633. #else

  1634.     av_free(c->lumMmx2FilterCode);

  1635.     av_free(c->chrMmx2FilterCode);

  1636. #endif

  1637.     c->lumMmx2FilterCode = NULL;

  1638.     c->chrMmx2FilterCode = NULL;

  1639. #endif /* HAVE_MMX */

  1640. 

  1641.     av_freep(&c->yuvTable);

  1642.     av_free(c->formatConvBuffer);

  1643. 

  1644.     av_free(c);

  1645. }

  1646. 

  1647. struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,

  1648.                                         int srcH, enum PixelFormat srcFormat,

  1649.                                         int dstW, int dstH,

  1650.                                         enum PixelFormat dstFormat, int flags,

  1651.                                         SwsFilter *srcFilter,

  1652.                                         SwsFilter *dstFilter,

  1653.                                         const double *param)

  1654. {

  1655.     static const double default_param[2] = { SWS_PARAM_DEFAULT,

  1656.                                              SWS_PARAM_DEFAULT };

  1657. 

  1658.     if (!param)

  1659.         param = default_param;

  1660. 

  1661.     if (context &&

  1662.         (context->srcW      != srcW      ||

  1663.          context->srcH      != srcH      ||

  1664.          context->srcFormat != srcFormat ||

  1665.          context->dstW      != dstW      ||

  1666.          context->dstH      != dstH      ||

  1667.          context->dstFormat != dstFormat ||

  1668.          context->flags     != flags     ||

  1669.          context->param[0]  != param[0]  ||

  1670.          context->param[1]  != param[1])) {

  1671.         sws_freeContext(context);

  1672.         context = NULL;

  1673.     }

  1674. 

  1675.     if (!context) {

  1676.         if (!(context = sws_alloc_context()))

  1677.             return NULL;

  1678.         context->srcW      = srcW;

  1679.         context->srcH      = srcH;

  1680.         context->srcRange  = handle_jpeg(&srcFormat);

  1681.         context->srcFormat = srcFormat;

  1682.         context->dstW      = dstW;

  1683.         context->dstH      = dstH;

  1684.         context->dstRange  = handle_jpeg(&dstFormat);

  1685.         context->dstFormat = dstFormat;

  1686.         context->flags     = flags;

  1687.         context->param[0]  = param[0];

  1688.         context->param[1]  = param[1];

  1689.         sws_setColorspaceDetails(context, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],

  1690.                                  context->srcRange,

  1691.                                  ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  1692.                                  context->dstRange, 0, 1 << 16, 1 << 16);

  1693.         if (sws_init_context(context, srcFilter, dstFilter) < 0) {

  1694.             sws_freeContext(context);

  1695.             return NULL;

  1696.         }

  1697.     }

  1698.     return context;

  1699. }